Pinking machine



May 5, 1942. M. GLASSBERG PINKING MACHINE Filed May 11, 1939 2 Sheets-Sheet l 5 s T N N5 R E 0 Wm n l G A w Y n B J m W y 1942- M. GLASSBERG 2,281,761

PINKING MACHINE Filed May 11, 1939 2 SheetsSheet 2 INVENTOR jflownzs 61615562? ATTozuEYs WITNESSES Patented May 5, 1942 OFFICE PlNKING MACHINE Morris Glassberg, Kingston, N. Y., assignor of one-half to Joseph E. Honig, Kingston, N. Y.

Application May 11, 1939, Serial No. 272,973

13 Claims. (Cl. 112-422) This invention relates to sewing machine attachments, and more particularly to an improved attachment for pinking. This attachment is adapted to be attached to a standard sewing machine and to be operated by the same power which operates the machine. It is further adapted to be arranged wholly beneath the bed plate of a sewing machine.

An object of this invention is to provide a simple positively acting pinker arranged beneath the bed of the machine and adapted to be applied to the ordinary commercial machine.

A further object is to provide a pinker which will be balanced in its construction so as to bviate the use of springs for counterbalancing and reciprocating purposes, and in which the reciprocating parts will be reduced to a minimum.

A further object of this invention is to provide a pinking device which may be put into and out of operation by the operator of the machine instantaneously and without the necessity of registering the pinking attachment; with the opera tion or the needle, and to provide a clear unobstructed bed immediately when the machine is set for plain sewing.

My device is adapted to be used with the standard Singer machines of the 95 class, wherein the rotating hook shaft is coupled to the main arm or power shaft by means of gears and a vertical arm shaft. It may be adapted to these machines without changing their structure and by merely boring several holes in the bed of the machine.

In the accompanying drawings Fig. 1 is a side view partly in cross section of my device applied to the customary machine, the dot-and-dash lines outlining the conventional parts of the sewing machine;

Fig. 2 is a bottom plan View of my attachment;

Fig. 3 is a cross sectional view of the pinking knife mounted in the throat plate, taken on the lines 33 of Fig. 4;

Fig. 4 is a cross sectional View taken on the line 44 of Fig. 3;

Fig. 5 is a bottom plan view taken on the line 5--5 of Fig. 3;

Fig; 6 is a cross sectional view taken on the line 6-5 of Fig; 1;

Fig. 7 is a view of a piece of fabric showing the stitchin and the pinking, completed thereon.

Referring to the drawings, and more particu larly to Fig. l in which the conventional machine H] with an arm I I, bed l2, needle mechanism 13, and bolts M, is. shown by dot-and-dash lines, I provide a pivot casting H! which is fastened to the bed of the machine by screws l5. The casting M has two downwardly extending arms 15' and I 1 upon which the rocker arm I8 is pivoted upon the bolts l9 and 20. At one end of the arm 18 is a fork 21 on which a yoke 22 is pivoted: at 23 and 24 on the bolts 25 and 25.

Upon the upper end of the yoke 22 is mounted a knife 39 which extends through the throat plate 3i and which is held upon the yoke 22 by means of a screw or pin 32 or any suitable means. The knife 3.0 is substantially a parallelogram in shape providing two triangular cutting members 33 and 34. Only one of the members operates at a time, being reversible, as shown in Fig. 5. The cutting member 33' would operate while the cutting member 34 would not be used. When the pinker is in operation the cutting member 33 operates against the edge 35 of the throat plate with a shearing action against, the material 355 performing one cutting movement to every two or more stitches of the needle I3, thus producing the pinked edge 31 at the same time as the stitches 58 are made.

At the lower end of the yoke 22 a frame 4%! is pivoted through the holes M. This frame is substantially rectangular in shape in order not to interfere with the support 43. At the opposite end of the frame it is a spring 44 which is fastened to a screw 45 extending through the plate 45 on the rocker arm Iii. A nut 41 controls the tension of the spring M against the plate 46 and thereof in close contact with the corresponding member 35 of the throat plate 3| in order to produce a shearing action.

At the opposite end of the rocker arm l8is a roller 58, mounted upon a roller shaft 5|. A centering pin 52 is screwed into the bed [2 and extends through an aperture 53 in the rocker arm it. An arm is pivoted at 6! to the rocker arm [8 in the opening 62. At the outer end of the arm 60 is another roller 533 mounted on a roller shaft 64.

Mounted in the rocker arm [8 is a screw 10 extending through the arm [8 and having at its lower end a carriage H. Mounted on the carriage H is a cam lever 72 pivoted at 73. be seen that by moving the cam lever 72 downwardly the arm 60 bearing the roller 63 will be allowed to drop. A nut 14 on the screw 153 controls the adjustment of the carriage H and the pressiue exerted by the cam lever 12.

At the outer end of the machine a casting 89 is fastened to the bed by means of bolts 8|. In the casting is mounted a shaft 82 fastened by the It will set screw 83. A screw 84 on the outer end of the shaft 82 holds the sleeve 90 on the shaft. The sleeve 90 is provided with a beveled gear 9| which meshes with the beveled gear 92 on the lower end of the shaft 93 which shaft operates a rotating hook shaft 94 in the conventional machine. A substantially egg-shaped cam 100 is eccentrically mounted on the outer edge of the sleeve 90.

The cam I has an inner contacting face I0! and an outer contacting face I02. The inner contacting face IOI engages the roller 50 while the outer contacting face engages the roller 63. It will be seen that the action of the inner contacting face Nil is to force the roller 50 upwardly, while the function of the outer contacting face I02 is to force the roller 63 downwardly. It will be further seen, by looking at Fig. 1, that the inner contacting face Illl operates to move the pinking knife downwardly into the throat plate 3| while the operation of the outer contacting face I02 downwardly against the roller 63, raises the knife above the throat plate 3 l It will be noted that the substantially eg shaped cam increases the speed of motion of the rocker arm I 8 at that part of the cam nearest its axis, thus increasing the speed of the knife 30 as it goes in and out of engagement with the throat piece 3|.

It will also be seen that by dropping the cam lever 12 downwardly so that the point 75 thereof is out of engagement with the arm 60, the arm in) will drop, putting the roller 63 out of engagement with the outer contacting face H12 and thus removing the force which raises the knife 30 and putting the pinker out of operation. When the cam lever 12 is raised again, the point 15 thereof will force the arm 60 upwardly putting the roller 63 into engagement with the outer contacting face I02 and causing the pinker to be placed into operation. It will be seen that this may be done instantaneously and that it will not be necessary for the operator to register the needle with the pinking device.

It will be further seen that when the cam lever 12 is dropped so that the arm 6t may drop and the roller 63 placed out of engagement with the outer contacting face M2, the only force which operates upon the rocker arm I8 is that transmitted by the action of the contacting face lill against the roller 50 which acts to keep the knife 30 against the edge 35 of the throat plate 3| resting upon the bed l2 of the machine and prevents it from raising above the throat plate. By making the rocker arm I8 slightly heavier on the end nearest the knife, the action of gravity will cause the knife 30 to rest against the bed I 2 of the machine.

I claim:

- 1. A pinking attachment for sewing machines, including a gear adapted to engage a driven shaft of said sewing machine, an eccentric cam mounted on said gear, said cam having an inner and outer contact face, a rocker arm pivoted below the bed of said machine, means on said rocker arm for engaging the inner and outer face of said cam, said means comprising two rollers, one engaging the inner contact face of said cam and one engaging the outer contact face of said cam, and means for disengaging the second-mentioned roller from the outer contact face of said cam.

2. A pinking attachment for sewing machines, including a rocker arm pivotally mounted at approximately the center thereof under the bed of said machine, means for positively rocking said arm at one end thereof, a fork at the opposite end of said arm, a yoke pivotally mounted on said fork, a knife on said yoke adapted to cooperate with the throat plate of said machine, and means on said yoke cooperating with said rocker arm to yieldingly force said knife into engagement with said throat plate.

3. A pinking attachment for sewing machines, including a rocker arm pivotally mounted under the bed of said machine, means for rocking said arm including a gear engaging a driven shaft of said sewing machine and a substantially eggshaped cam on said gear, said cam having an inner and outer contacting face, means on said rocker arm to engage the inner and outer faces of said cam, and additional means for disengaging said means from the outer face of said cam.

4. A pinking attachment for sewing machines, including a pinking knife, means for reciprocating said knife consisting of a rocker arm mounted under the bed of said sewing machine, means communicating with one end of said rocker arm for reciprocating said knife, and means at the opposite end of said rocker arm to operate said arm, said means including a roller on the end of said arm, a cam mounted on a shaft, an inner face on said cam engaging said roller, a second arm pivotally mounted on said rocker arm, and a roller on said second arm adapted to engage the outer face of said cam.

5. A pinking attachment for sewing machines, including a gear engaging the power mechanism of said sewing machine, a cam mounted for rotation with said gear, said cam having an inner and outer contacting face, a rocker arm pivotally mounted below the bed of said sewing machine, means at one end of said rocker arm for operating a pinking knife, and means at the opposite end of said rocker arm for engaging said cam to rock said arm, said means including a roller on the end of said rocker arm and adapted to engage the inner contacting face of said cam, and an arm pivoted to said rocker arm and having a roller adapted to engage the outer contacting face of said cam.

6. A pinking attachment for sewing machines, including a gear engaging the power mechanism of said sewing machine, a cam mounted for rotation with said gear, said cam having an inner and outer contacting face, a rocker arm pivotally mounted below the bed of said sewing machine, means at one end of said rocker arm for operating a pinking knife, and means at the opposite end of said rocker arm for engaging said cam to rock said arm, said means including a roller on the end of said rocker arm and adapted to engage the inner contacting face of said cam, and an arm pivoted to said rocker arm and having a roller adapted to engage the outer contacting face of said cam, and means for disengaging the roller on said pivoted arm from contact with the outer face of said cam.

7. A pinking attachment for a sewing machine, including a rocker arm pivotally mounted under the bed of said machine, means for rocking said arm including a gear engaging a driven shaft of said sewing machine, a cam on said gear, said cam having an inner and outer contacting face, means on said rocker arm to engage the inner and outer faces of said cam, and additional means for disengaging said arm from the outer face of said cam.

8. A pinking attachment for sewing machines, including a rocker arm pivotally mounted at approximately the center thereof under the bed of said machine, means for positively rocking the arm at one end thereof, a fork at the opposite end of said arm, a yoke pivotally mounted on said fork, a knife on said yoke adapted to cooperate with the throat plate of said machine, means on said yoke cooperating with said rocker arm to yieldingly force said knife into engagement with said throat plate, and means for placing said rocker arm at rest.

9. The combination with a sewing machine having a reciprocatory needle of pinking mechanism comprising a threat plate having an opening with converging shearing walls, a pinking head with converging walls for coacting with the throat plate walls, an arm carrying said head and extending vertically into the sewing machine beneath the bed thereof, means connected with the apparatus driving said needle and coupled to said arm for operating said head in said throat plate in timed relation with said needle comprising cam means, reduction gearing between said driving apparatus and said cam means, a lever pivotally carrying said arm, cam follower means mounted on said lever and engaging said cam means, and spring means arranged between said arm and lever for continually urging said arm in a direction whereby the apex of said head is urged towards the apex of said throat plate to insure a clean shearing action on the downward strokes of said arm and head.

10. The combination with a sewing machine having a reciprocatory needle of pinking mechanism comprising a ledger blade having an opening with converging shearing walls mounted substantially flush with the bed of the machine, a pinking knife with converging walls for successively coacting with the ledger blade Walls, an arm carrying said knife and extending into the sewing machine beneath the bed thereof, and means connected with the apparatus driving said needle and coupled to said arm for operating said knife in said ledger blade in timed relation with said needle comprising a lever pivotally carrying said arm, a cam, reduction gearing between said driving apparatus and said cam, roller means mounted on said lever and engaging said cam, and an instrumentality on said lever for disengaging said roller means from said cam to render said pinking knife inoperative in said ledger blade in a position substantially flush with the top surface thereof.

11. The combination with a sewing machine having a reciprocatory needle of pinking mechanism comprising a ledger blade having an opening with converging shearing walls mounted substantially flush with the bed of the machine, a pinking knife with converging walls for successively coacting with the ledger blade walls, an arm carrying said knife and extending into the sewing machine beneath the bed thereof, and means connected with the apparatus driving said needle and coupled to said arm for operating said knife in said ledger blade in timed relation with said needle comprising a lever pivotally carrying said arm, a cam, reduction gearing between said driving apparatus and said cam, roller means mounted on said lever and engaging said cam, an instrumentality on said lever for disengaging said roller means from said cam to render said pinking knife inoperative in said ledger blade in a position substantially flush with the top surface thereof, and spring means arranged between said arm and lever for continually urging said arm in a direction whereby the apex of said knife is urged towards the apex of said ledger blade to insure a clean shearing action on the downward strokes of said arm and knife.

12. The combination with a sewing machine of pinking mechanism comprising a throat plate, a pinking knife for coacting with said throat plate, an arm carrying said knife and extending into the sewing machine beneath the bed thereof, and means coupled to said arm for positively operating said knife upwardly to clear the plane of said plate and permit material to pass therebetween and downwardly to pink the material by the coaction of said knife and said plate comprising a lever pivotally carrying said arm, a double-faced cam, two rollers mounted on said lever and respectively engaging the faces of said cam, and an instrumentality for disengaging one of said rollers from said cam to render said pinking knife inoperative in a position substantially flush with the top surface of said throat plate.

13. The combination with a sewing machine of pinking mechanism comprising a throat plate having an opening with converging shearing walls, a pinking head with converging walls for coacting with the throat plate Walls, an arm carrying said head and extending into the sewing machine beneath the bed thereof, and means for reciprocating said arm for operating said head in said throat plate including a pivoted lever, said arm being pivoted on said lever, spring means arranged between said arm and lever for continually biasing said arm about said member in a direction whereby the apex of said head is urged towards the apex of said throat plate to insure a clean shearing action on the downward strokes of said arm and head, means for adjusting the force of said spring on said arm, a double-faced cam, two rollers mounted on said lever and engaging the faces of said cam, and an instrumentality extending from said lever for disengaging one of said rollers from said cam to render said pinking head inoperative in a position substantially flush with the top surface of said throat plate.

MORRIS GLASSBERG. 

